3

1

0.3

0.1

0.03

0.01

10 µ

100 µ

1 m

10 m

Pulse Width

PW (S)

100 m

1

10

DM

P

PW

T

D =

PW

T

ch – c(t) = s (t) •

ch – c

ch – c = 4.17 °C/W, Tc = 25 °C

θ

γ

θ

θ

D = 1

0.5

0.2

0.01

0.02

0.1

0.05

1 shot

Pulse

Tc = 25°C

Normalized Transient Thermal Impedance vs. Pulse Width

Vin Monitor

D.U.T.

Vin

–10 V

V

= 30 V

DD

tr

td(on)

Vin

90%

90%

10%

10%

Vout

td(off)

Vout

Monitor

50

Ω

90%

10%

Switching Time Test Circuit

Waveforms

2SJ389 L , 2SJ389 S